I'd love to see a variety of peafowl colormorphs in general. There's so many neat looking ones that are fairly plentiful across the private domestic trade, which is where most zoos seem to source their animals from anyway. But if nothing else, piebald would be nice.
I keep flip flopping on how much I'd actually like to see this, but I'd also like to mention that there are some absolutely gorgeous morphs bred into raccoon dogs. Aside from standard albinism/leucism, though, they're all specifically something that fur farms breed for, so I'm not sure how I'd feel about them appearing as something you could just breed into by chance in game... and I feel that it should go without saying that I detest the very existence of fur farms in the first place. Still, it's not impossible to imagine some fur farm individuals being rescued by a zoo, so who knows? They stuck to the more-or-less most natural morphs for the red fox though, so I don't really expect anything here aside from hopefully an albino/leucistic one.